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Given that the observations are , find the two lines of regression. Estimate the value of when .
Given that the observations are $(9,-4), (10, -3), (11,-1), (13,1), (14,3), (15,5), (16,8)$, find the two lines of regression. Estimate the value of $y$ when $x = 13.5$.
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From ISC 2018 Specimen Mathematics Paper 1, question 20(a).